<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>加加减减</title>
</head>
<style>

</style>

<body>
    <div id="app">
        <div>
            <ul>
                <li v-for="(item,index) in sz" :key="index">
                    {{item}}
                    <button @click="b(index)">删除</button>
                </li>
            </ul>
        </div>
        <button @click="a">生成</button>
    </div>
    <script src="../vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                sz: [1, 5, 3]
            },
            methods: {
                //生成
                a() {
                    this.sz.push(Math.floor(Math.random() * 20) + 1)
                },
                //删除
                b(index) {
                    this.sz.splice(index, 1)
                }
            }
        })
    </script>
</body>

</html>